Feed mechanism for saw mill carriages



(No Model.)

N. HOFFMAN.

FEED MBGHANISM FOR SAW MILL GARRIAGE$. No. 359,076. Patented Mar. 8, 1887.

ATTORNEYS.

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ELIZABETH, \VEST VlltGIrfIl-k.

FEED MECHANlSWi FOR SAW- MILL CARRlAGES.

SPECIPZCATION :"orzning part of Letters Patent No. 359,076, dated March 8, 1887.

Application liled ()rtobcl' 29, 1556.

To (0 whom it may concern:

Be it known that I NEWTON Hormrw, of Elizabeth, in the county of \Virt and State of XVest Virginiahavc invented a new and useful Improvement in Saw-Mill Feeds, of which the following is a specification.

My invention relates to saw-mill feeds for propelling the saw-carriage back and forth at variable rates of speed or holding it stationary, as desired; and it consists in a pair of friction cone-pulleys arranged in peripheral contactand placed between the source ofpower and the carriage-pinion, one of said conepulleys being mounted in adj ustable boxes, which permit its small end to be brought into frictional contact with the large end of its mate, or its large end into frictional contact with the small end of its mate, or the middle line of one to engage the middle line of the other, to produce, respectively, a fasteuslower, or uniform motion.

My invention also consists in the peculiar means for adjusting the cone-pulley, as will be hereinafter more fully described, with refen ence to the drawings, in whieii Figure 1 is a plan view of the saw mill feed with the wheel hLhand-levcr N, and part of shaft M broken away. Fig. 2 is a vertical section through thelinea wof Fig. l and looking in the direction of the arrow, and 3 is avertical section through one of the journalboxes of the adjustable cone-pulley.

A represents the bed-fraine,in which isjournaled a shaft, carrying within the frame a rig idly-attached cone friction-pulley, B,and upon the outside of the frame, atone end, a p ulley,C, through which power is received from a driving-belt, and at the other end a friction-pulley, D. Firmly fixed on a shaft beside the conepulley B is another cone )ulley B, with its larger end opposite the smallercnd ofits mate. The shaft of this cone-pulley Bis jonrnaled in boxes a a, which have a sliding adjustment on the bed about a curve-line struck by a radius from the center of the concpnlley, the boxes being for this purpose disposed upon fixed metal plates and provided with undcrlapping lips, (see Fig. 3,)jwhich hold the boxes down and prevent them from rising.

Now, in transmitting motion from the cone B to B by frictional contact, itwill be seen that when the small end ofB engages the large end Serial No. 217,535. (No model.)

of B a slow motion will be imparted to the shaft of B, and when the large end of B engages the small end of B a fast motion is imparted to the shaft of B, and when the middle of one concpulley engages the middle of the other both rcvolveat the same speed. To permit these different contacts to be madcbetween the cone-pulleys, B is made with its conical face slightly crowning or rounded,and its axis is made adjustable about a central vertical line, as follows: To thejournal-box at the small end ofcone-pulley B is attached one end of a pair of toggle-arms, E E, the outer arm, E, of which is jointed to fixed plate, F, on the bed-frame, and the middle joint of which toggle-arms is connected to a bar, G. At the large end ofcone 13 another pair of togglearms, 11 H, connects the journal-box at that end to a fixed plate, F, on the bed-frame, and the middle joint is connected to me other end ofbar G. This bar G is connected to a vertical handlever, I, fulcrumed at the bottom to thebcdirame.

The bar G is somewhat shorter than the dis tance between the outer joints of the togglearms, so that when one pair of toggle-arms is straight or in alignment the other pair is projected inwardly.toward the hand-lever. The object of this is to make one pair of toggle arms thrust upon the jou rnal-bor; at oneend of the cone at the same time that it pulls upon the journal-box at the other end. .Vhen,therefore, the hand-lever I is thrown so as to straighten the toggle-arms E E, as in dotted lines, and bend or flex the other toggle'arms, H H, the small end of friction-cone B is proj eeted against the large end of B, and a fast motion is imparted to the shaft of B. 'When thehand-lever is moved to its full extent in the opposite direction, small end of cone B is drawn away from the large end of B, and the large end of B is thrown. into contact with the small end of B and a slow motion is given to the shaft of B. Then the hand-lever stands vertical, or stands half-way between its extreme positions, the middle lines of the two cones are engaged and a uniform motion is transmitted.

To take up looseness or lost motion and adj ust-the cones to each other to compensate for wear, the outer ends of the togglearms are jointed to the plates F F, which are made adjustable by slots and bolts 1) b on the beam J,

and which beam J is adjusted in seats K to or from the cones bywedges c c.

To transmit the motion of the cone B to the saw-carriage, the shaft of cone B is provided with a small friction-pulley, L, which bears against a large friction-pulley, M, on a shaft, M, which also carries the carriage-pinion M", that engages with the rack or toothed bar on the under side of the saw-carriage in the wellknown way. The end of the shaft M next to the cone B is carried in an eccentric, d, in the journal-box, which eccentric is provided with a hand-lever, N, by which the friction-pulley M may be engaged with the friction-pulley L to run the carriage forward, or be projected against the large frictionpulley D to run the carriage back. The reverse motion which the large pulley D gives, it will be seen, is very much faster than the forward n1otion,by reason of the large diameter of pulley D as compared with pulley L. At an intermediate adjustment of hand-lever N the pulley M does not engage either pulley D or L.

Having thus described my invention, what Iclaim as new is 1. The combination, with the running-gear of a saw-mill feed, of a pair of friction-cones having the large end of one adjacent to the small end of the other, one of such cones be ing made adjustable about an imaginary line passing between the ends of the cone in direction at right angles to its axis, to alternately throw its opposite ends into frictional engage ment with its mate for regulating the speed, substantially as shown and described.

journal-boxes and having a middle connecting-bar and lever, and the plates F F, connected to the outer ends of the toggle-arms and made adjustable, substantially as shown and described.

4. In a saw-mill feed, the combination,with running-gear for the carriage and a conepnlley, of a laterally-oscillating cone-pulley having its axis in the same plane with the first and having its sides made crowning or curved, substantially as and for the purpose described.

The above specification of my invention signed by me in the presence of two subscribing witnesses.

NEWTON HOFFMAN.

Witnesses:

EDWD. XV. BYRN, CHAS. A. PETTIT. 

